Covering metals.



G. HELLMIGH. COVERING METALS. APPLICATION FILED MAB. 10, 1906.

Patented Jan. 26, 1909.

mwb: I L01 UNITED STATES PATENT O FFICE. GARlL HELLMICH, OF DETROIT,MICHIGAN, ASSIGNOR O-F ONE-HALF Tf) JOSEPH KAUFMANN,

OF DETROIT, IVIIGHIGAII.

COVERING METALS.

Specification of Letters Patent.

Patented Jan. 26, 1909.

Application filed March 10, 1906. Serial No. 305,266. I

'- ferent from that of the core, an exam l e being the brass or coppercovered rod or 'ar used in the manufacture of various useful andornamental articles.

Sheathed bodies of the character described are very desirable on accountof their bei rustless and by reason of the superior .finis andornamental appearance the sheathing or covering provides, and areextensively used in place of solid non-oxidizable metals by reasonof-the relatively small cost of production, the core forming the majorportion of the body being of an inexpenslve metal,

'- covered rods or bars,in which the seam or as iron. The difficultythat has existed in the past,, however, has been the production of asheathed body in which the sheathing or covering would not crack or enat the joint during the bending of the ody into the desired article ofmanufacture, and a further drawback has been the conspicuousness of theseam or joint.

The present invention resides in a method of forming compoundarticles,particularly joint is inconspicuous and is re'vented absolutelyfrom opening during t tion of bending.

In the drawings,-Figure 1 is a diagrammatic view illustrating the stepsof my method; Fig. 2 is a perspective View, showing details of theprocess for forming the compound body; Figs. 3,4 and are sectional views1 taken on lines 3.3, 44 and 55 of Fig.

2; Fig. 6 is a vertical central section through the mechanism employedin carrying. out the method; Fig. 7 is a front view of one of the dies;Fig. 8 is a front elevation of the positioning or guide plate; Fig. 9 isa front elevation of" the drawing die; and Fig. 10 is a sectional view,illustrating a modified form of comp ound'body.

e opera- In general, the method may be said to consist in applying asheet metal strip or sheathing about the exterior of a channeled core orblank and over the outer side edges ofthe walls, in then folding theblank or core upon itself longitudinally, thereby abutting the marginalclamping t e same between the core sides, and finally reducing thecovered core-for the purpose of increasing the clam ing effect exertedby the blank upon the s eathing to prevent the opening of the seam'orjoint upon subsequent bending of the article.

In carrying out the method commercially, I preferably first form'theblank or core and so fashion the same that it will be capable ofexerting a maximum clam ing effect upon the sheathing when reduce andthis without cutting the abutting portions of the covering. The core Imake preferably of soft ortions of the sheathing and iron, and in theform shown in Figs.,3 and 4,

which I find is the bestshape to produce the results desired. It will beseen that the blank, indicated by the reference-letter a, is

ractically' of half-round metal, channeled lbngitudinally as at I),having the tops of its side portions or walls fiat, as indicated at a b,and each top provided with sharp marginal edges 0 (1. Further, the coreis of such substance or thickness that it will be capableof being foldedlongitudinally in the manner described, and subsequently reduced withoutbeing crushed.

The strip of covering materialor sheathing c is applied by suitablemechanism hereinafter described to the exterior of the blank, and thestrip is preferably of such width that it will extend not only-over theflat to s of the blank sides but artially within the c annel 1).Subsequent y, the blank is folded longitudinally u on it, the flat topportions meeting and c amping therebetween the marginal portions of thecovering. The inner marginal edges-d serve to first grip during thefolding movement the sheath ng sides, and prevent the same from -sl1ping until the operation of folding is comp eted. The sharp outer edges0 are then-inclose proximity, and serve to form a joint of minimum size.Finally, the covered blank passes' tent that subse uent opening of thejoint by bending "is abso utely prevented. Further,

the flat meeting portions of the blank, in addition to producing themaximum clamping effect desired, prevent the cuttin of the sheathingduring the reducing of the core.

It will be obvious fromthe steps of the method described that thereduction of the core, in addition to increasing the clamping effect ofthe latter u on the sheathing, also serves to minimize tiie size of thejoint, the more tightly the meeting portions of the core are broughttogether the less conspicuous the' seam. After the covered body has beenreduced in the manner described, it is in readiness to be bent into anydesired form without sheathing are arranged preferably upon suitablereels, as d and e, in such relation to one another that as the materialpasses to the dies the sheathingmay be properly applied 3 over the core.

represents the form of die employed for fo ding the sheathing over thecore, consisting of upper and lower die plates, indicated by thenumerals 10 and 11, suitably secured together by bolts g. The die platesare formed respectively with channels forming a passage, indicated at h,through which the core and covering plate or stri are drawn, thearrangement of the parts be such that as the core and covering passthrough the diethe marginal edges of the latter will be bent over theedges of the core and between the meeting faces of the side tops, asillustrated, and the core folded on its lon itudinal axis.

0 produce the additional clamping re-- quired to prevent the seamopemng, the core is passed through a drawing or narrowing die '11lprovided with an orifice j. The dies may e mounted. upon a suitablebed, as k, which in turn is provided with a flange 1 against which thedrawing die '11 engages, said being provided with an orifice 'm throughwhich the completed work is drawn.

Afterwards, the article may be coiled upon a 4 suitable drum or reelindicated at n. The

die f is provided with a positioning or guide plate, indicated at g,constructed with a suitably-she ed channel 1' which serves to make theimtial fold of the marginal edges of the securing strip in starting thestri or cover upon its passage through the ies. The positioning memberalso serves to keep the Work from vibrating sidewise, and hold the partsso that the core will be exactly the'center of the covering strip.

' It will be readily understood from the ,fore oing description of themethod that the finis ed article need' not necessarily be a solid rod orbar, as the'hollow or tubular rod indicated in Fig. 10 can as Well beproduced. It is merely essential that the core or blank should be ofsuflicient substance to permit of its being finally reduced in diameterto obtain the additional clamping effect without its being crushed. Itis also to be understood that the form of blank described is the one Ipreferably emplov, but that it is susceptible of various modificationswithout in any manner de arting from the spirit of my invention. orinstance, the inner edges, as d, may be dispensed With, but I prefer touse the same in orderto obtain the est results. Also, the sheathing neednot necessaril extend entirely over the to portions of t e blank or intothe channel this is preferable as abetter gripping of the sheathing bythe blank or core is obtained.

Attention is further directed to the fact that the sheathing orcovering, While in most instances of a metal different-from the core,

but

is not necessarily so, it being immaterial from the standpoint of theinvention as to what metal the blank is sheathed With.. What I claim asmy invention is,-j

1. The-herein-des'cribed method ofmaking compound metal bodies,consisting in forming a channeled blank, in applying a metal coveringstrip about the exterior of the blank and, over the blank edges, foldingthe blank along its longitudinal axis and abutting and clamping the mar'inal portions of the covering strip, and fina y reducing the coveredblank by pressure.

2.. The herein-described method of makin compound metal bodies,consisting informing a blank, in apply' g a .metal covering strip.aboutHthe exterior of theblank an over the blank ed es, folding theblank .along its longitudina axis and abutting and clamping the marginalportions of the coverin strip, and finally reducing-the covered blan bypressure.

In testimony whereof, I have signed this specification in the presenceof two 'sub scribing witnesses.

- 1 CARL HELLMICH'.

Witnesses: v

N. S. WRIGHT,

E. SI IELBURG.

